High-Temperature Passivation of the Surface of Candidate Materials for MSR by Adding Oxygen Ions to FLiNaK Salt

Карфидов, Э. А.; Zaikov, Yu. P.; Никитина, Е. В.; Seliverstov, Konstantin; Dub, Alexey V.

doi:10.3390/ma15155174

Cited by 8 publications

(3 citation statements)

References 28 publications

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“…At the same time, special requirements are imposed regarding the quality of prepared fluoride melts to be used as a working medium in MSRs [1,12,13]. Particular attention is paid to oxygencontaining impurities due to their significant effect on corrosion processes [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Determination of the Oxygen Content in the LiF–NaF–KF Melt

et al. 2023

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The present paper is dedicated to the quantitative determination of oxygen-containing impurities in the LiF–NaF–KF eutectic using electrochemical (cyclic and square-wave voltammetry) and reduction melting methods. The LiF–NaF–KF melt was analyzed before and after purifying electrolysis. The amount of oxygen-containing impurities removed from the salt during purification was determined. It was found that after electrolysis, the concentration of oxygen-containing impurities decreased by 7 times. The results obtained via electrochemical techniques and reduction melting were well-correlated, which made it possible to evaluate the quality of the LiF–NaF–KF F melt. To verify the analysis conditions, mechanical mixtures of LiF–NaF–KF containing Li2O were analyzed using the reduction melting method. The oxygen concentration in the mixtures varied from 0.672 to 2.554 wt. %. Based on the analysis results, the dependence approximated by the straight line was obtained. These data may be used to draw calibration curves and to further develop the procedure of oxygen analysis of fluoride melts.

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Section: Introductionmentioning

confidence: 99%

Determination of the Oxygen Content in the LiF–NaF–KF Melt

et al. 2023

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“…It is known that chromium, iron, and nickel in the composition of the construction alloys may be subjected to corrosion in FLiBe and FLiNaK salts [15][16][17][18][19][20]. The corrosion rate of these materials depends on the presence of different admixtures, such as oxides and hydroxide ions [21,22], HF [22], and metals fluorides (for instance, CrF 3 , NiF 2 , etc.)…”

Section: Introductionmentioning

confidence: 99%

Interaction between Iron Fluoride and Molten FLiBe

et al. 2022

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The equilibrium potentials of iron in a LiF-BeF2-FeF2 melt were measured using the EMF method and were dependent upon the temperature and iron fluoride concentrations. The empirical equations for the isotherms and equilibrium polytherms of the iron fluoride concentration were obtained. The cathode polarization of iron fluoride in the molten mixture of lithium and beryllium fluoride was measured using the current switch off method from the stationary state. It was found that in the studied temperature and concentration ranges of iron fluoride in the LiF-BeF2 electrolyte, the valence state of iron in the melt is mainly +2. According to the experimental values of the equilibrium potentials of the iron electrode in the LiF-BeF2-FeF2 melt, the conditional standard potentials of iron were calculated relative to the fluoride reference electrode in the molten mixture of lithium and beryllium fluoride. The conditional standard values of the Gibbs energy change were calculated at the formation of iron difluoride from the element in the form of dilute solutions, as were the thermodynamic values (enthalpy and entropy) when iron difluoride was mixed with LiF-BeF2.

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“…% of Li 2 O showed a larger weight loss than that corroded by FLiNaK without Li 2 O 10 . Karfidov et al also reported that the corrosion rate of 12Cr18Ni10Ti steel in FLiNaK with a concentration of O 2− <200 ppm was larger than that in FLiNaK with 500 ppm of O [2][3][4][5][6][7][8][9][10][11] . Yang also observed Cr and Mn oxides formed near the grain boundaries of SS316H attacked by thermally purified NaF-KF-UF 4 salt (FUNaK), indicating the interactions between oxides and metals 12 .…”

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Static corrosion of stainless steel 316H in chemically purified molten NaF-KF-UF4 salt

Park,

Leong,

Zhang

2024

npj Mater Degrad

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The purification of salt is indispensable for mitigating the corrosion of structural materials for molten salt reactors or other molten salt applications. This study develops a salt-purification system to synthesize and purify NaF-KF-UF4 salt (FUNaK) using Ar purging and hydrofluorination of impurities. Chronoamperometry is also used to remove metallic impurities in the hydrofluorinated FUNaK. This purified FUNaK is then used for a static corrosion test of stainless steel 316H (SS316H) to study the effectiveness of salt purification in mitigating its corrosion. For comparison, results from a previous study about the corrosion of SS316H by thermally purified FUNaK are used. FUNaK with UF3 is also synthesized for a static corrosion test with the same condition to investigate the impact of UF3 on corrosion. The results show that the corrosion of SS316H is significantly reduced by using the chemically purified FUNaK compared to thermally purified FUNaK.

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High-Temperature Passivation of the Surface of Candidate Materials for MSR by Adding Oxygen Ions to FLiNaK Salt

Cited by 8 publications

References 28 publications

Determination of the Oxygen Content in the LiF–NaF–KF Melt

Determination of the Oxygen Content in the LiF–NaF–KF Melt

Interaction between Iron Fluoride and Molten FLiBe

Static corrosion of stainless steel 316H in chemically purified molten NaF-KF-UF4 salt

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